以空气和去离子水为标准样,利用Anton Paar DMA60 DMA602振动管密度计测定了常压下甲酰胺在20℃～60℃间几乎每相间1℃的密度数据.其中系统温度的控制精度在0.01℃,密度的测量精度为1×10^(-4)g·cm^(-3).同时,利用3种不同的函...以空气和去离子水为标准样,利用Anton Paar DMA60 DMA602振动管密度计测定了常压下甲酰胺在20℃～60℃间几乎每相间1℃的密度数据.其中系统温度的控制精度在0.01℃,密度的测量精度为1×10^(-4)g·cm^(-3).同时,利用3种不同的函数关系,将测量密度与对应温度的数据进行非线性最小二乘法拟合,给出了密度函数的对应参数.对比得出密度与温度间的最优函数关系,而且,用最优函数计算密度的标准误差为1×10^(-4)g·cm^(-3),符合密度测量精度要求.展开更多
Densities(ρ) and dynamic viscosities(η) for three binary mixtures of n-decane with 1-pentanol,1-hexanol and1-heptanol are presented at temperatures from 293.15 to 363.15 K and atmospheric pressure over the entire co...Densities(ρ) and dynamic viscosities(η) for three binary mixtures of n-decane with 1-pentanol,1-hexanol and1-heptanol are presented at temperatures from 293.15 to 363.15 K and atmospheric pressure over the entire composition range.The density and viscosity are measured using a vibrating tube densimeter and a cylindrical Couette type rotating viscometer,respectively.Excess molar volumes(V^E),viscosity deviations(△η) and excess Gibbs energy of activation of viscous flow(△G^(*E)) are calculated from the experimental measurements.Intermolecular and structural interactions are indicated by the sign and magnitude of these properties.Partial molar volumes and infinity dilution molar partial volumes are also calculated for each binary system.These results are correlated using Redlich-Kister type equations.展开更多
文摘以空气和去离子水为标准样,利用Anton Paar DMA60 DMA602振动管密度计测定了常压下甲酰胺在20℃～60℃间几乎每相间1℃的密度数据.其中系统温度的控制精度在0.01℃,密度的测量精度为1×10^(-4)g·cm^(-3).同时,利用3种不同的函数关系,将测量密度与对应温度的数据进行非线性最小二乘法拟合,给出了密度函数的对应参数.对比得出密度与温度间的最优函数关系,而且,用最优函数计算密度的标准误差为1×10^(-4)g·cm^(-3),符合密度测量精度要求.
基金Supported by the National Council of Science and Technology(CONACyT)(SEP-2004-C01-47817)
文摘Densities(ρ) and dynamic viscosities(η) for three binary mixtures of n-decane with 1-pentanol,1-hexanol and1-heptanol are presented at temperatures from 293.15 to 363.15 K and atmospheric pressure over the entire composition range.The density and viscosity are measured using a vibrating tube densimeter and a cylindrical Couette type rotating viscometer,respectively.Excess molar volumes(V^E),viscosity deviations(△η) and excess Gibbs energy of activation of viscous flow(△G^(*E)) are calculated from the experimental measurements.Intermolecular and structural interactions are indicated by the sign and magnitude of these properties.Partial molar volumes and infinity dilution molar partial volumes are also calculated for each binary system.These results are correlated using Redlich-Kister type equations.
